, Dummy(..)
, DecorrTerms(..)
, DecorrWeights(..)
+ , DecorrSamples(..)
+ , EntropyVars(..)
+ , WVBitstream(..)
, RIFFHeader(..)
, RIFFTrailer(..)
+ , ConfigInfo(..)
, Unknown(..)
)
where
+import qualified Codec.Audio.WavPack.BitString as B
+import Codec.Audio.WavPack.Internal
import Control.Monad
import Data.Binary
+import Data.Binary.BitPut (putBit, putNBits, runBitPut)
import Data.Binary.Get
import Data.Binary.Put
+import Data.Binary.Strict.BitGet (getBit, runBitGet)
+import qualified Data.Binary.Strict.BitGet as BG
import Data.Bits
+import qualified Data.ByteString as S
import qualified Data.ByteString.Lazy as L
import Data.Int
+import qualified Data.Strict as S
import Data.Typeable
import qualified Data.Vector.Unboxed as UV
import Prelude.Unicode
getSubBlock 0x00 = fmap SubBlock (get ∷ Get Dummy )
getSubBlock 0x02 = fmap SubBlock (get ∷ Get DecorrTerms )
getSubBlock 0x03 = fmap SubBlock (get ∷ Get DecorrWeights)
+ getSubBlock 0x04 = fmap SubBlock (get ∷ Get DecorrSamples)
+ getSubBlock 0x05 = fmap SubBlock (get ∷ Get EntropyVars )
+ getSubBlock 0x0A = fmap SubBlock (get ∷ Get WVBitstream )
getSubBlock 0x21 = fmap SubBlock (get ∷ Get RIFFHeader )
getSubBlock 0x22 = fmap SubBlock (get ∷ Get RIFFTrailer )
+ getSubBlock 0x25 = fmap SubBlock (get ∷ Get ConfigInfo )
getSubBlock unknownID
= if unknownID .&. 0x20 ≡ 0 then
fail ("Unknown WavPack metadata ID: " ⧺ show unknownID)
= Dummy {
-- | Must be less than 2^25 bytes long due to the limitation
-- of WavPack specification.
- dumSize ∷ Word32
+ dumSize ∷ !Word32
}
deriving (Eq, Show, Typeable)
metaSize = fromIntegral ∘ UV.length ∘ decwVec
instance Binary DecorrWeights where
- put = UV.mapM_ (putWord8 ∘ packW) ∘ decwVec
- where
- packW ∷ Int16 → Word8
- packW w
- = let w' | w > 1024 = 1024
- | w < -1024 = -1024
- | otherwise = w
- w'' | w' > 0 = w' - ((w' + 64) `shiftR` 7)
- | otherwise = w'
- w''' = (w'' + 4) `shiftR` 3
- in
- fromIntegral w'''
+ put = UV.mapM_ (putWord8 ∘ packWeight) ∘ decwVec
get = do n ← remaining
- vec ← UV.replicateM (fromIntegral n) $ fmap unpackW getWord8
+ vec ← UV.replicateM (fromIntegral n)
+ $ fmap unpackWeight getWord8
-- THINKME: the same caution as DecorrTerms, but never
- -- try to reverse the vector simply. Think about the
+ -- try to simply reverse the vector. Think about the
-- interleaving.
return $ DecorrWeights vec
+
+-- | Decorrelation samples
+data DecorrSamples
+ = DecorrSamples {
+ -- | The decorrelation sample vector stored in the metadata
+ -- as-is. Actual interpretation of the vector depends on the
+ -- number of channels and each corresponding decorrelation
+ -- terms.
+ decsVec ∷ !(UV.Vector Int32)
+ }
+ deriving (Eq, Show, Typeable)
+
+instance Metadata DecorrSamples where
+ metaID _ = 0x04
+ metaSize = fromIntegral ∘ (⋅ 2) ∘ UV.length ∘ decsVec
+
+instance Binary DecorrSamples where
+ put = UV.mapM_ (putWord16le ∘ fromIntegral ∘ log2s) ∘ decsVec
+ get = do n ← remaining
+ vec ← UV.replicateM (fromIntegral $ n `div` 2)
+ $ fmap (exp2s ∘ fromIntegral) getWord16le
+ return $ DecorrSamples vec
+
+-- | Median log2 values.
+data EntropyVars
+ = EntropyVars {
+ -- | Median log2 values for channel A, which always exists.
+ entVarA ∷ !(Word32, Word32, Word32)
+ -- | Median log2 values for channel B, which is absent when it's
+ -- mono.
+ , entVarB ∷ !(S.Maybe (Word32, Word32, Word32))
+ }
+ deriving (Eq, Show, Typeable)
+
+instance Metadata EntropyVars where
+ metaID _ = 0x05
+ metaSize ev
+ | S.isNothing $ entVarB ev = 6
+ | otherwise = 12
+
+instance Binary EntropyVars where
+ put ev
+ = do putMedians $ entVarA ev
+ case entVarB ev of
+ S.Nothing → return ()
+ S.Just medsB → putMedians medsB
where
- unpackW ∷ Word8 → Int16
- unpackW w
- = let w' ∷ Int8
- w' = fromIntegral w
- w'' ∷ Int16
- w'' = (fromIntegral w') `shiftL` 3
- w''' | w'' > 0 = w'' + ((w'' + 64) `shiftR` 7)
- | otherwise = w''
- in
- w'''
+ -- THINKME: words.c(write_entropy_vars) is a destructive
+ -- subroutine. It calls read_entropy_vars() to read the
+ -- values back to compensate for the loss through the log
+ -- function.
+ putMedians ∷ (Word32, Word32, Word32) → Put
+ putMedians (med0, med1, med2)
+ = do putWord16le $ log2 med0
+ putWord16le $ log2 med1
+ putWord16le $ log2 med2
+
+ get = do medsA ← getMedians
+ medsB ← do isMono ← isEmpty
+ if isMono then
+ return S.Nothing
+ else
+ fmap S.Just getMedians
+ return $! EntropyVars medsA medsB
+ where
+ getMedians ∷ Get (Word32, Word32, Word32)
+ getMedians
+ = do med0 ← fmap exp2 getWord16le
+ med1 ← fmap exp2 getWord16le
+ med2 ← fmap exp2 getWord16le
+ return (med0, med1, med2)
+
+-- | WV Bitstream
+data WVBitstream
+ = WVBitstream {
+ wvStream ∷ !B.BitString
+ }
+ deriving (Eq, Show, Typeable)
+
+instance Metadata WVBitstream where
+ metaID _ = 0x0A
+ metaSize = (`div` 8) ∘ B.length ∘ wvStream
+
+instance Binary WVBitstream where
+ put = putLazyByteString ∘ B.toByteString ∘ wvStream
+ get = fmap (WVBitstream ∘ B.fromByteString) getRemainingLazyByteString
-- | RIFF header for .wav files (before audio)
data RIFFHeader
= RIFFHeader {
- riffHeader ∷ L.ByteString
+ riffHeader ∷ !L.ByteString
}
deriving (Eq, Show, Typeable)
instance Metadata RIFFHeader where
metaID _ = 0x21
+ metaSize = fromIntegral ∘ L.length ∘ riffHeader
instance Binary RIFFHeader where
put = putLazyByteString ∘ riffHeader
-- | RIFF trailer for .wav files (after audio)
data RIFFTrailer
= RIFFTrailer {
- riffTrailer ∷ L.ByteString
+ riffTrailer ∷ !L.ByteString
}
deriving (Eq, Show, Typeable)
instance Metadata RIFFTrailer where
metaID _ = 0x22
+ metaSize = fromIntegral ∘ L.length ∘ riffTrailer
instance Binary RIFFTrailer where
put = putLazyByteString ∘ riffTrailer
get = fmap RIFFTrailer getRemainingLazyByteString
+-- | Configuration information.
+data ConfigInfo
+ = ConfigInfo {
+ -- | fast mode
+ cfgFast ∷ !Bool
+ -- | high quality mode
+ , cfgHigh ∷ !Bool
+ -- | very high
+ , cfgVeryHigh ∷ !Bool
+ -- | bitrate is kbps, not bits / sample
+ , cfgBitrateKbps ∷ !Bool
+ -- | automatic noise shaping
+ , cfgAutoShaping ∷ !Bool
+ -- | shaping mode specified
+ , cfgShapeOverride ∷ !Bool
+ -- | joint-stereo mode specified
+ , cfgJointOverride ∷ !Bool
+ -- | dynamic noise shaping
+ , cfgDynamicShaping ∷ !Bool
+ -- | create executable
+ , cfgCreateEXE ∷ !Bool
+ -- | create correction file
+ , cfgCreateWVC ∷ !Bool
+ -- | maximize hybrid compression
+ , cfgOptimizeWVC ∷ !Bool
+ -- | calc noise in hybrid mode
+ , cfgCalcNoise ∷ !Bool
+ -- | obsolete (for information)
+ , cfgLossyMode ∷ !Bool
+ -- | extra processing mode level (1-6)
+ , cfgExtraModeLevel ∷ !(S.Maybe Word8)
+ -- | no wvx stream w/ floats & big ints
+ , cfgSkipWVX ∷ !Bool
+ -- | compute & store MD5 signature
+ , cfgMD5Checksum ∷ !Bool
+ -- | merge blocks of equal redundancy
+ , cfgMergeBlocks ∷ !Bool
+ -- | optimize for mono streams posing
+ , cfgOptimizeMono ∷ !Bool
+ }
+ deriving (Eq, Show, Typeable)
+
+instance Metadata ConfigInfo where
+ metaID _ = 0x25
+ metaSize ci
+ | S.isJust $ cfgExtraModeLevel ci
+ = 4
+ | otherwise
+ = 3
+
+instance Binary ConfigInfo where
+ put ci
+ = let !bs = runBitPut $
+ do putBit $ cfgOptimizeMono ci
+ putNBits 2 (0 ∷ Word8) -- unused
+ putBit $ cfgMergeBlocks ci
+ putBit $ cfgMD5Checksum ci
+ putBit $ cfgSkipWVX ci
+ putBit $ S.isJust $ cfgExtraModeLevel ci
+ putBit $ cfgLossyMode ci
+ putBit $ cfgCalcNoise ci
+ putNBits 2 (0 ∷ Word8) -- unused
+ putBit $ cfgOptimizeWVC ci
+ putBit $ cfgCreateWVC ci
+ putBit $ cfgCreateEXE ci
+ putBit $ cfgDynamicShaping ci
+ putBit $ cfgJointOverride ci
+ putBit $ cfgShapeOverride ci
+ putBit $ cfgAutoShaping ci
+ putBit $ cfgBitrateKbps ci
+ putBit $ cfgVeryHigh ci
+ putBit $ cfgHigh ci
+ putBit False -- unused
+ putBit $ cfgFast ci
+ putBit False -- unused
+ in
+ do putLazyByteString (L.reverse bs)
+ case cfgExtraModeLevel ci of
+ S.Nothing → return ()
+ S.Just eml → putWord8 eml
+
+ get = do bs ← getBytes 3
+ eml ← do xmode ← fmap (¬) isEmpty
+ if xmode then
+ fmap S.Just getWord8
+ else
+ return S.Nothing
+ let r = runBitGet (S.reverse bs) $
+ do optimizeMono ← getBit
+ BG.skip 2 -- unused
+ mergeBlocks ← getBit
+ md5Checksum ← getBit
+ skipWVX ← getBit
+ extraMode ← getBit
+ lossyMode ← getBit
+ calcNoise ← getBit
+ BG.skip 2 -- unused
+ optimizeWVC ← getBit
+ createWVC ← getBit
+ createEXE ← getBit
+ dynamicShaping ← getBit
+ jointOverride ← getBit
+ shapeOverride ← getBit
+ autoShaping ← getBit
+ bitrateKbps ← getBit
+ veryHigh ← getBit
+ high ← getBit
+ BG.skip 1 -- unused
+ fast ← getBit
+ BG.skip 1 -- unused
+ return ConfigInfo {
+ cfgFast = fast
+ , cfgHigh = high
+ , cfgVeryHigh = veryHigh
+ , cfgBitrateKbps = bitrateKbps
+ , cfgAutoShaping = autoShaping
+ , cfgShapeOverride = shapeOverride
+ , cfgJointOverride = jointOverride
+ , cfgDynamicShaping = dynamicShaping
+ , cfgCreateEXE = createEXE
+ , cfgCreateWVC = createWVC
+ , cfgOptimizeWVC = optimizeWVC
+ , cfgCalcNoise = calcNoise
+ , cfgLossyMode = lossyMode
+ , cfgExtraModeLevel = if extraMode then
+ eml
+ else
+ S.Nothing
+ , cfgSkipWVX = skipWVX
+ , cfgMD5Checksum = md5Checksum
+ , cfgMergeBlocks = mergeBlocks
+ , cfgOptimizeMono = optimizeMono
+ }
+
+ case r of
+ Left err → fail err
+ Right ci → return ci
+
-- | Unknown but optional metadata found in the WavPack block.
data Unknown
= Unknown {
projects / wavpack.git / blobdiff